Lock nut



April 1948- 7R. WQSMITH 2,439,191

I LOCK NUT I Filed Feb. 26, I946 5 7 hi h/7i w awo Patented Apr. 6, i948 UNITED STATES PATENT OFFICE LOCK NUT Robert W. Smith, Brunswick, Maine Application February 26, 1946, Serial No. 650,269

3 Claims. (Cl. ISL-23) This invention relates to locking nuts and more particularly to means for locking a nut on a bolt.

The principal object of the invention is the provision of a lock nut, wherein a nut is securely locked on a bolt in such manner that it cannot work itself loose.

A further object of the invention is the provision of a lock nut wherein the nut may be threaded on the associated bolt, as a whole, and may be locked by a simple and readily performed operation. I

Still a further object of the invention relates to the provision of a locking nut, comprised of relatively few parts, which may be readily assembled and disassembled and which is inherently sturdy and durable.

With these and still further objects in view, the invention resides in a certain novel construction and combination and arrangement of parts, the essential features of which are hereinafter fully described, pointed out particularly in the appended claims, and illustrated in the accompanying drawings, in which:

Figure 1 is a bottom plan view of a lock nut constructed in accordance with my invention;

Figure 2 is a vertical section taken on the line 2-2 of Figure 1;

Figure 3 is a locking section of the nut, illustrated in vertical elevation; and

Figure 4 is a sectional view taken vertically through a retaining nut, comprising a part of the invention.

Referring now to the drawings in detail, the nut I is provided with a wrench section 2 and with a reduced boss or extension 3, the extension having no external threads and being adapted slidably to engage the internally threaded lock operating nut 4, the threads 5 of the nut 4 sliding smoothly on the surface of the extension 3.

Adjacent the extension 3 is a still further reduced boss 6 having external threads I.

The nut I is internally threaded preferably with Acme type threads 8 three to the inch, for threadedly securing said nut l on a suitable bolt or threaded shaft end, not illustrated.

A section of the nut I corresponding precisely in internal outline to thelocking nut illustrated in Figure 3 of the drawings, is cut away leaving a gap 9 in the extension 3 and the boss 6 and providing an internal slot I in the wrench section aligned with the gap 9.

Within the gap 9 and the slot Iii may be inserted an internally threaded locking section I4, illustrated in Figure 3 of the drawings, provided with internal threads I adapted to complete the 2 internal threading 8 of the nut I, and provided with a reduced extension I2 and a further reduced extension I3 corresponding to the extension 3 and the boss 6 in diameter, respectively. The locking section I4 at its reduced extension I2 is provided with screw threads i6, preferably eight to the inch, and adapted to threadedly engage the nut which slidably engages the unthreaded extension 3. The further extension I3 of the locking section I4 is unthreaded.

Retaining nut I1 is internally threaded with threads I8 adapted to threadedly engage the external threads I of the boss 6 and is provided with an internal cut-away l9 subtending an'angle at least equal to that subtended by the extension I3 and of suificient depth to provide clearance for the screw threads I. Retaining nut I1 is provided with holes 29 suitable for a spanner wrench, which is required since the retaining nut i1 is circular in shape externally thereof.

In its application, the nut is applied to a threaded shaft portion or bolt, as a whole, by means of the wrench section 2, and after the nut has been tightened, the lock operating nut 4 may be tightened to cause relative translatory movement of the locking section I4 and the main nut section, whereby to lock the main nut.

While I have described one embodiment of my invention, it is to be understood that various modifications may be made in the arrangement of parts and in the details of structure, without departing from the spirit of the invention. as defined in the appended claims.

What I claim and desire to secure by Letters Patent of the United States is:

1. A lock nut comprising a wrench section having internal threads and provided with a longitudinal slot, a locking section slidable in said longitudinal slot and provided with external threads, a locking nut threadedly engaging said external threads.

2. A lock nut comprising an internally threaded wrench section carrying a separate longitudinally translatable locking section, and rotatable means externally carried and manipulated for translating one section with respect to the other.

3. A lock nut comprising a wrench section having internal threads and provided with a longitudinal internal arcuate cut-away, a locking section provided with internal thread sections matching the internal threads of said wrench section, and slidably engaging said cut-away, said locking section being provided with external threads, an external unthreaded reduced extension for said wrench section substantially align- 3 .4 ing with said external threads, a locking nut en- REFERENCE CITED gaging said external threads and siidable about 8 said reduced extension a retaining nut and re- The fOIIOWmg references are of record the taming screw threads formed on a still further file of this Patent: reduced extension of said wrench section, said 5 UNITED STATES PATENTS retaining nut being provided with an internal N arcuate slot at least co-extensive with said lock- Number ame Date mg section 1,204,623 Waller Nov. 14, 1916 ROBERT W. SMITH. 

